Sawing-machine



v R R E B D SAWING MACHINE.

No. 250,191. Patented Nov. 29,1881.

NITED STATES PATENT QFFICE.

DAVID BERRY, OF BOLINAS, CALIFORNIA.

SAWlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 250,191, dated November 29, 1881, Application filed August 30, 1881. (No model.)

To all whom it may concern:

Be it known that I, DAVID BERRY, of Bolinas, county of Marin, State of California, have invented an Improved Sawing-Machine; and I hereby declare the following to be afull, clear, and exact description thereof My invention relates to a new and useful device for sawing wood; and it consists of a main frame having a supplementary sliding frame containing a saw, which, by being moved back and forth with rapidity by means of a crank-wheel, is caused by its own weight to cut through a piece of wood held suitably underit. There are minor details of construction for the complete operation of the device, all of which will hereinafter more fully appearin the course of the following description, and by reference to the accompanying drawings, in which- Figure l is a perspective view of my invention. Fig. 2 is a longitudinal vertical section. Fig. 3 is a transverse vertical section.

LetArepresent the main or supporting frame of the device, preferably constructed as here shown, having a base-piece, B, a platform, 0, and a top, D. Upon the top is a frame, E, having a slot, at, its entire length. At the forward end of the frame is a vertical supplemental frame, F, consisting of side pieces secured to the vertical end strips. The frame fits down through the top of the main frame, and one of its end strips passes down through an elongated slot, 1), in the platform 0, whereby it is guided. It has enough space in the top to allow it to move forth and back. The other end strip of the frame F extends down beyond the end of the main frame. Within the frame F is the saw G. This is secured to end pieces, 0, which are attached at their tops to a cross-head, cl, havingabail or handle, 0, for convenience. The ends of the saw Grproject and fitthrough slots in the end strips of the frame F, so that said saw may be guided while still having a vertical play. The saw Grbeing thus secured Within the sliding frame is adapted to move forth and back therewith and have also a vertical play. It is set in the frame just tightly enough to remain where placedwhen the machine is at rest, but to fall down when jarred. It is made heavy enough, with its frame, to out the wood when drawn over it.

The platform (J is the support for the wood,

and as a further support I have the side frame, H, which is pivoted to the legs of the main frame under the platform 0. When in position itlies horizontallyand extends on each side to serve as a support for the wood. It is adapted to swing down toward a vertical position to be out of the way. It is held in position when horizontal by springsfsetin thelegs of the frameA.

Under the platform 0 is journaled a rod, I, the ends of which extend up on each side of the platform. This is a means for securing the wood to be cut, and I here call it a holding device. One arm is bent and extends upward through a curved rack, J, and is provided with a handle, as shown. When the piece of wood is laid transversely upon the platform 0 under the saw, which is raised up, the holding device I is pushed forward, its arms pressing down upon the wood, and is secured by the curved rack. The under sides of the arms may be corrugated, or provided with teeth, for better security in holding the wood. Having the wood in position my object is to move the supplementary frame F back and forth, and by shaking or jarring it cause the saw G to descend and be drawn across the wood. This I accomplish as follows: Upon the rear of the top frame, E, is a curved piece, K, having an extended slot, g, in its top. One end of this piece passes down through the slot at in the top frame, E, and is secured to the top D of the main frame, directly in the line of the sliding frame F.

Hingedor pivoted to the rear end of the sliding frame F is a connecting rod or pitman, L, the rear end of whichis pivoted to an oscillating arm, M. This arm passes down through the slot gin the curved piece K, and is pivoted therein. It passes down through the frame E and through the top of the frameA.

N represents a driving-wheel provided with a crank-handle, 0. It is journaled in the platform 0, and its axle is bent in the form of a crank, as shown by m. The other end of the crank-axle has a balance-wheel, P. The end of the oscillating arm M has a slot, at, through which the crank-axle 1n passes. By revolving the wheel N the crank-axle m moves up and down in the slot of the arm M and causes said arm to oscillate. In doing this it draws the pitman L back and pushes it forth, thus cans ing the frame F, with its saw, to slide as intended. The pitman L is so curved that when it is drawn back it strikes the forward end of the curved piece K and thus jars the saw-containing frame F and causes the saw to slip down. By moving the wheel rapidly the jar is rapid and forcible and the saw will go down at once, when it will by its own weight penetrate the wood as it is drawn back and forth.

Thejar which I have just explained is simply for the purpose of causing the saw to go down upon the wood at first. When once down there is no more necessity for the jar.

Icould, ifIfound it desirable,multiply speed by intermediate gearing.

The device may be constructed of any suitable material and may bedrivenby anypower.

I am aware that a saw-frame has been oonstructed consisting of the frame having side bars provided with ratchet-teeth and carrying also a ratchet-lever adaped to be tripped atthe end ofits throw by striking the end of the groove in which it works; but my device is a materially different construction.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

The frame A, in combination with the slid- 

